--- MITgcm/verification/global_with_exf/README	2003/08/07 02:31:29	1.3
+++ MITgcm/verification/global_with_exf/README	2003/08/15 01:42:44	1.4
@@ -1,4 +1,4 @@
-heimbach@mit.edu 07-Nov-2002.
+ heimbach@mit.edu 07-Nov-2002.
 This verification experiment is almost identical to the
 global_ocean.90x40x15 experiment, except that it uses
 the exf (and cal) package instead of the 
@@ -18,19 +18,23 @@
 
 menemenlis@jpl.nasa.gov 05-Aug-2003
 
-On-the-fly spatial interpolation has been added to pkg/exf.
+Input-field spatial interpolation has been added to pkg/exf.
 It is enabled by defining CPP option USE_EXF_INTERPOLATION
 in EXF_CPPOPTIONS.h or in ECCO_CPPOPTIONS.h
-Both bi-linear and bi-cubic (#define BICUBIC) are supported.
+Both bi-linear and bi-cubic interpolation schemes are supported.
 
-This package is a placeholder until more general coupler
-is made available by ESMF project.  It assumes that input
-grid is Cartesian with arbitrary latitude increments in the
-y-direction but with equidistant longitude increments in
+This package is a placeholder until a more general coupler
+is made available by the ESMF project.  The output grid can be
+arbitrary (cubed-sphere should be OK), but it is assumed that
+the input grid is Cartesian with arbitrary latitude increments
+in the y-direction and with equidistant longitude increments in
 the x-direction.  The input grid must encompass the complete
 output grid in the y-direction (i.e., extrapolation is not
-supported) and it is assumed that the grid is periodic in
-the x-direction.
+supported).  It is also assumed that the grid is periodic in
+the x-direction; to use the interpolation routine with a
+non-periodic domain, make sure there is sufficient padding
+at the edges, i.e., two points for bicubic and one for bilinear
+interpolation.
 
 The verification/global_with_exf experiment has been modified
 to use the USE_EXF_INTERPOLATION option, the input grids
@@ -43,5 +47,5 @@
    *_nlon and *_nlat :: input x-grid and y-grid size
 
 In this particular example the input and output grids are
-the same, so the results of the verification experiment remained
+the same, so the results of the verification experiment remain
 unchanged from before.